Question

Exercitiul 5!
Va rog!
Descompunere de cls 7..nu prea ma descurc..helpp!!!

Answer 1

a)x^2+3x+2=(x^2+x)+(2x+2)
=x(x+1)+2(x+1)
=(x+1)(x+2)
b)x^2+5x+4=(x^2+x)+(4x+4)
=x(x+1)+4(x+1)
=(x+1)(x+4)
c)x^2+7x+12=(x^2+3x)+(4x+12)
=x(x+3)+4(x+3)
=(x+3)(x+4)
d)x^2+5x+6=(x^2+2x+3x+6)
.. =x(x+2)+3(x+2)
=(x+2)(x+3)
e)x^2+7x+10=(x^2+2x)+(5x+10)
=x(x+2)+5(x+2)
=(x+2)(x+5)
f)x^2+9x+20=(x^2+4x)+(5x+20)
=x(x+4)+5(x+4)
.. =(x+4)(x+5)
g)x^2+8x+15=x(x+3)+5(x+3)=(x+3)(x+5)
h)x^2+9x+14=x(x+2)+7(x+2)=(x+2)(x+7)
i)x^2+11x+30=x(x+5)+6(x+5)=(x+5)(x+6)
j)x^2+15x+56=x(x+7)+8(x+7)=(x+7)(x+8)
k)x^2+12x+35=x(x+5)+7(x+5)=(x+5)(x+7)
l)x^2+7x+6=x(x+1)+6(x+1)=(x+1)(x+6)
m)x^2+9x+8=x(x+1)+8(x+1)=(x+1)(x+8)
n)x^2+13x+42=x(x+6)+7(x+6)=(x+6)(x+7)
o)x^2+11x+18=x(x+2)+9(x+2)=(x+2)(x+9)
6.a)x^2-5x+6=x^2-2x-3x+6=x(x-2)-3(x-2)=(x-2)(x-3)
b)x^2-7x+12=x^2-3x-4x+12=x(x-3)-4(x-3)=(x-3)(x-4)......